Hydroxypropyl methylcellulose (HPMC) ophthalmic solution is a type of eye drop commonly used to relieve dryness and irritation in the eyes. It is also known as artificial tears. HPMC is a type of lubricant that helps to moisten the surface of the eye and alleviate discomfort caused by conditions such as dry eye syndrome or exposure to environmental factors like wind, smoke, or dry air. HPMC ophthalmic solution works by forming a protective film over the surface of the eye, which helps to retain moisture and prevent evaporation of tears. This can help alleviate symptoms such as itching, burning, or the sensation of a foreign object in the eye.